In the United States, which sport is known as "soccer"?

The names of association football are the terms used to describe association football, the sport most commonly referred to in the English-speaking world as "football" or "soccer".

The rules of association football were codified in the United Kingdom by the Football Association in 1863, and the name association football was coined in the UK to distinguish the game from the other versions of football played at the time, in particular rugby football. The word soccer is an abbreviation of association (from assoc.) and first appeared in English private schools and universities in the 1880s (sometimes using the variant spelling "socker").

For nearly a hundred years after it was coined, soccer was an accepted and uncontroversial alternative in Britain to football, often in colloquial and juvenile contexts, but was also widely used in formal speech and in writing about the game.

"Soccer" was a term used by the upper class whereas the working and middle class preferred the word "football"; as the upper class lost influence in British society from the 1960s on, "football" supplanted "soccer" as the most commonly used and accepted word.

There is evidence that the use of soccer is declining in Britain and is now considered there as an American English term.

Association football is known as "football" in the majority of countries where English is an official language, such as the United Kingdom, the Commonwealth Caribbean, Malta, India, Singapore, Hong Kong, etc.